Sewing machine



4 Sheets-Sheet 1 Feb. 20, 1940. K. HEIL SEWING MACHINE Filed Nov. 3, 1957 K, HEIL SEWING MACHINE Filed Nov. 3, 1 937 Feb. 20, 1940.

4 Sheets-Sheet 2 Feb 20, 1940.

K. HEIL SEWING MACHINE Filed NOV. 5, 1937 4 Sheets-Sheet 3 wwmwww Feb. 20, 1940. K. HEIL SEWING MACHINE Filed Nov. :5. 1957 r 4 Sheets-Sheet 4 Patented Feb. 20, 1940 that STATES P ATENT OFFICE SEWING MACHINE Application November 3, 1937, Serial No. 172,505

In Germany November 24, 1936 6 Claims.

. The invention relates to a sewing machine with an oscillating head for the needle shank bearing for the production of groups of stitches and in particular for the sewing on of pom- 5 poms and other decorations on house shoes and the like. An important object of the invention consists in the head carrying the upward and downward moving needle rod being displaceable transversely to the plane of oscillation for the lopurpose of producing a group of stitches defining a polygonal outline.

The accompanying drawings illustrate by way of example certain embodiments of the invention.

Figure l is a longitudinal section through a lo sewing machine made according to the invention;

Figure 2 is a view of this machine from the front seen in the direction of the arrow A of Figure 1;

Figure 3 is a plan of the machine;

20 Figures 4-6 show in front view, side view and plan the form of a revolving looper;

Figures 7-15 show this looper in seven diflerent positions of rotation during the forming of the loops; t

M Figure 16 is a front view of a different and particularly advantageously designed looper;

Figure 17 is a section through this looper;

Figure 18 is a plan of this looper;

Figures l9-2Ishow this looper in the forma- 90 tion of the loop in seven different positions of rotation; V

Figure 28 shows a separate device for automatically controlling the movement of the work pressure foot;

M Figure 29 is a fragmentary view, partlybroken away, of the looper drive shaft.

Figures 30 and 31 are side and end elevations, respectively, of one of the elements shown in, Figure 29.

.49 The main spindle 3 for the upward and downward movement of the needle and which extends at the front into the head 2 carrying the needle bar hearing at the back is coupled nonrotatably but movable axially, within a sleeve; 5 carried 45 in the arm housing I of the machine. The crank disc 5 which by a connecting rod t moves the needle bar l up and down, is'fitted on the shaft 3 and the needle bar 'I carries the needle 6. The spindle 3 is slidably but non-rotatably con- 50 nected to the sleeve 4 by the key ll which extends radially from the shaft 3 and rides in a slot in the forward end of the sleeve 4 so as to key the shaft and sleeve together for rotation while permitting relative axial motion. n the head projection embracing the spindle 3 are fixed the clamping pieces 9 and it of which the clamping piece 9 causes amovem'ent axially oi the shaft 3 to the needle bar head, whilst the spindle 3 and the end surface groove ll efiects an oscillating movement of the needle bar hear ing, the axial movement being of insumcient 35 amount to remove the roller is from its groove i l about said spindle ii.

The sleeve t is carried by means of ball hearings E5 in the housing l. The friction pulley it is axially movable on the sleeve 3 but is prevented from rotating thereon by means of a key. There is furthermore fitted on the sleeve 4 loose ly rotatable the gear it as also the wedge block i'la which is secured from rotation by the fork wedge H surrounding it. Between the block We and the friction disc is keyed tothe sleeve t is the thrust ball bearing ill. The friction disk it cooperates in the usual way with the continuously rotating belt pulley Elli, depressing the wedge ll forcing the block lid to the right as viewed in Figure l, and forcing the disk 99 into drivenengagement with the pulley 20, lifting the wedge ll permitting the disk is to retract from the pulley. On the wedge it is provided a brake'plece it for stopping the friction pulley l9 and an arresting roller 22 the use of which will be explained later.

In the housing '1 is furthermore carried a control. shaft 23 on which are fitted the cam piece it, a gear 2d, a bevel gear 28a and a gear 25; m

these gears are fixed on the shaft 23. A further spindle 26 is journaled in a bearing 21 of the housing I and is prevented from axial displacement by a set ring as also by the bevel gear .28. I The bevel gear 28 is firmly fitted on the spindle M 26 and meshes withthe bevel gear Ma. The front end ofthe spindle it is connected by two universal joints 29, it" (and an extensible intermediate portion) with a spindle all which is journaled in a foot 36 of the downwardly en tending arm 2' of the head 2 and carries at the front end forwardly of the bushing 32 the bevel gear 3|. The latter meshes with the bevel gear 34 which is also carried in a part of the foot to which is the carrier body of the lower loop forming mechanism, and is connected by the set screw 31 with the rotating looper 35. .The looper axis is so arranged that it intersects the axial direction of the needle rod.

There is furthermore fitted on the carrier body 36 the needle plate 33. This needle plate suitably accompanying therefore the movements of the needle bar head is fitted close under the stationary work supporting table t9 which forms the front end of a bracket arm 4| which can be adjusted in different fixed positions at the eyes 42, 43 of the housing I by means of eccentric pins M, 35. The bracket arm forms at 38 the bearing for a double armed lever 39 which at the front end (over the needle hole on the work table) carries an open funnel 4U widening out upwardly, as holder for thework, and the rear end of which is connected by a chain with a.

treadle (not shown). By means of atension spring 50, the funnel 40 is kept continually pressing down on the supporting table 49.

The operation of the. sewing machine, assuming that this is to serve for sewing pom-poms on to house-shoes by means of four stitches to be placed in the corners of a square is as follows. The machine is at rest; only the belt pulley 20 runs idly; By actuating a treadle the lever 39 is drawn down at the rear end whereby the funnel 40 at the front end of the lever is raised from the supporting table 49 and gives room for placing in position the house-shoetogether with the pom-pom placed in the desired position. When the articles lie in the correct position on the table 49, this treadle is released. whereupon the funnel 60 is spring pressed. onto the articles and holds them firmly. The shape in funnel form of this part is particularly advantageous since it presses down the pom-pom threads only in the inner part, whilst the outer part remains free and loose; the pom-poms thus retain a better appearance (see Fig. 7); in addition, the funnel forms an excellent finger protection from damage by pricking where the 'operator unnecessarily allows the hand on the starting of the machine to rest on the workpiece.

table.

After the clamping of the work pieces, a sec-- ond treadle is actuated which by means of the connecting rod 46 draws the wedge l1 downward, thus pressing the wedge block Ha against the friction disc l9 which is now coupled with the belt pulley 20 and can also immediately rotate since on the drawing down of the rod 46, the brake piece 2! is drawn downward and has released the friction disc Hi. The friction "disc l9 and with it the sleeve 4, as also the shaft 3, will now be set in rotation; this rotation" will continue on the release of the second ,treadle since on the rising of the connecting rod 46 the arresting roller 22 fixed on it is no longer in the notch intended for it in the hub of the gear Hi (this gear has in the. meantime further ro-.' tated) and consequently the connecting rod cannot reach its highest position,'so that neither the wedge ll can efi'ect a dis-engagement of the friction disc nor can the brake piece 2| reach the brake rim or flange running round the 'friction disc IS. The dropping of the roller 22 into its notch and thus the stopping ofthe machine will only take place when the gear l6 has completed a full revolution. If new the gear ratio from .the gear Hi to the gear 25 is chosen at 2:1

and from the gear 24 to the gear 24?) at 4:1, 'it will be seen that withone rotation of the -gear Hi the shaft 23 carries out two revolutions,

- the spindle 23 (that is, with four rotations of the shaft 3) in consequence of the in and out and of the swinging'movement of the needle bar bearing, the needle makes four double stitching strokes which are located in the corner points of a square. In making these stitches the needle bar axis takes four positions which are located on a wedge-like surface with the apex directed upwards. The cam grooves H and H are preferably so chosen that the necessary forward and backward movement and the lateral displacement of the needle bar bearing take place in the pauses between the stitching strokes.

After carrying out the first four stitches, the cycle is recommenced again inthe same way, the needle on the repetition coming again into the old stitch holes whereby a raveling out of the seam (with chain stitch) is made difiicult. After carrying out the eighth stitch, the sewing machine stops in consequence of the roller 23 falling into its arresting notch. By actuating the first treadle, the funnel 42 can be raised and the sewn work be exchanged for work to be sewn. The operator has only to look after this replacement is unnecessary.

The connection of the four stitches takes place in the present example in chain stitch'manner needle for the next loop is again moved forward in order at the right moment to pass under the needle so that the needle can pass through it.

To this end, the looper 35 has a special aperture 35' in itshead.

Figures 16 to 18 show a looper of different design and the loop formation in various positions of rotation being shown in Figs. 19 to 2'7. The looper according to Figs. 4 to 6 is not well.

suited in those cases-where the article or the decoration are of non-uniform flexibility or contain hard parts embedded therein. In such cases,

it may at times occur that the needle is deflected and then does not pass into the opening 35, so that breakage of the needle may occur. order to be able to advantageously employ the invention in such difficult cases, according to Figs. 16 to 18 thelccp forming part of the looper 5| is made hollow so that the needle projecting beyond its axis never strikes against an obstacle. even in the case of 'marked deflections;

In Fig-.

ure 17 the actual looper body is enclosed by a casing 52 of conical form fitted firmly thereon but which is omitted in Figs. 16 and '18 for thesake of clarity.

The .looper body merges at the rear into the pin 53 and has at the front the spiral shaped .looper tooth 54 curved round the axis of the looper and which from approximately its centre upto its tip is provided with a spreading piece 55'which serves as bearing wall for the one.

branch of the loop.

Figures 19-27 show the looper when forming 30 of the work; holding it during the sewing process sewing commences and that the needle 3 has for the first time penetrated the work and also the pom-pom to be sewn thereon, and is on the return from its lowest position. In Figure 20 the needle has risena further amount; the tip of the looper tooth 54 penetrates into the gap between the needle 8 and the thread. The following figures represent the further positions of rotation of the looper revolving clockwise. The formation of the loops and their taking by the looper tooth will be seen; in Figure 23 there is for the first time Shown the opening out of the loop by the spreader 55. the motion of the opened-out loop by the member 55 and Figures 26-27 show the penetration of the needle into the opened-out loop for the start of the formation of the new loop within the one before. Figure 27 corresponds with respect to the position'of rotation of the looper to Figure 20. During the further rotation of the looper the situations shown-in Figures 20 to 27,

till

inclusive, are repeatedwith the formation always of a new loop within the loop formed during the previous revolution.

Themeans for practising the invention as described is capable of many modifications without departing from the inventive idea. Thus, for example, on varying the transmission ratios of the corresponding gear transmissions,

stitch groups may be .easily formed with only three or with more than four stitches, and on the other hand instead of the two-fold placing of the separate stitch groups, a three-fold, fourv fold, etc, or even just a single stitch group may be formed. The control movement of the needle bar bearing can be produced instead of by the grooves of a cam in any other known way. By varying the curves, the distance apart of the stitches from each other can be increased or reduced; this is of importance with porn-poms .si'nce preferably the stitches are made so far from each other that the pom-pom knot is not Q penetrated, while on the other hand it is sewn on as close to this knot asipossible in order not to press the pom-pom down more than can be helped.

A further perfection of the machine can consist in the funnel dill serving to hold the work down not being actuated by a separate treadle but the lever it carrying the funnel at being connected by a. spring rod with the wedge l1 so that by thedrawingdown oi the connecting rod at at the same time and automatically,v the funnel iil is lowered onto the work, where it remains until the machine has carried out the prescribed number of the stitches. Fig. 28 shows such a construction; a leveniit carrying the tunnel to and being pivotable at 38 is connected by a pivot M with the rod 58 carrying a sliding block 59 betweenhelical springs 5b, iii. The sliding block bill is pivoted at $2 to the connecting rod 46 which actuates the wedge ll. [Simultaneously with the disengagement of the sewiing machine drive, the funnel 40 is raised and remains in this position until on the next ongagement of the machine drive by drawing down the rod 46"it is forced down onto the fresh work inserted in the meantime. This modification saves a treadle and has the advantage that the work can be placed on the machine during the stoppage thereof.

Figs. 29-31 show the extensible intermediate portion 29 (see Fig. 1) between the two universal joints 29, 29' clearly and to alarger scale.

Figures 24-27 show i The intermediate portion consists of two sleeves 53, 53' pivoted to the. joints 29, 29 and having longitudinal slots t4, 55'. These slots embrace projections 65' of a hollow middle piece 66 and the sleeves t3, (63' are spaced each to the other in such a way that the middle piece so is axially movable in them, The engagement of the projections $5 with the sides of the slots b4. 64'

causes the shafts 2t and 30 to rotate simultaneously. The bore in the middle piece 66 is the same as in the sleeves $3, 63; therefore an in- .terior'pin t'i may prevent the parts d3, 63', 65 from becoming disengaged while permitting lengthwise extension and contraction in accordance with the adjustment of the bracket arm M and the forward and rearward motions of the head.

The use of the machine is also not restricted to the field of sewing on pom-poms and other articles bf decoration. For example the 1118. chine can be used also for the sewing on of periorated buttons. Also where only a temporary attachment of two or more articles is desired, the machine can be used with-advantage, for example in dye works in order to attach together articlesoi clothing, linen or pieces of fabric which appertain to each other and are to remain with certainty for the same length of time in the same dyeing agent.

Ii claim:

l. A sewing machine having a sewing arm, a sewing head, a reciprocable needle bar in said head, means for supporting said head for motion lengthwise of said arm and for oscillation about an axis lengthwise of said arm, and means actuable during a sewing operation to impart said motions to said head to cause stitching to take place at points spaced in two relatively transverse directions.

2. A sewing machine having a sewing arm, a

impart said motions to said head to cause stitching to take place at points spacedin two relative transverse directions.

3. A sewing machine having a sewing arm, a

sewing head, a reciprocable needle bar in saidhead, a needle carried by said bar, means for supporting said head for motion lengthwise of said am and for oscillation about an axis lengthwise of said arm, means cooperating with said needle to form stitches, means movable with said head for supporting said cooperating means, driving means for said needle bar and cooperating means, and means driven by said driving means for imparting said lengthwise and oscillatory motions to said head. i

4. A sewing machine having a sewing head, a needle bar reciprocable in said head, means supporting said head for rocking motion about an axis and for motion substantially parallel to said axis, means for reciprocating said bar, a work support beneath said needle bar, a needle carried by said bar, mechanism beneath said work support with which said needle cooperates to form stitches, means carried by said head for supporting said mechanism, means for actuating said mechanism, and .means for moving said iii) head alternately parallel'to said axis and rocking g5 on said axis between successive complete recip rocations of said needle bar.

5. A sewing machine having a casing, a sewing head carried by said casing for oscillation about, a pivot and for'motion parallel to the axis of said pivot, a stationary work support carried by said casing, a looper positioned beneath said work support, a bracket carried by said sewing head and supporting said looper for motion with said head, a needle bar carried by said head and supporting a needle for coopertion with said looper, means in said casing for actuating said needle bar and for moving said head, and an extensible shaft from said actuating means to said looper.

6. A sewing machine havin a casing, a sewing anemia head carried by said casing for oscillation about a pivot and for motion parallel to the axis of said pivot, a stationary work support carried by said casing, a looper positioned beneath said work support, ,a bracket carried by said sewing head and supporting said looper for motion with said head, a needle bar carried by said head and supporting a. needle for cooperationwith said looper, means in said casing for actuating said needle bar and ior moving said head, and a shaft including a pair of universal joints and an extensible and oontraotible portion between said joints operatively connecting said looper and actuating means. I

KARL HEIL. 

